Definition of "stonking"

For instance he might see a White-eared Honeyeater, a not uncommon bird in the heathy areas at Bunyip, but in his excitement to call it, something in his brain scrambled and came out as: `White-cheeked Honeyeater!' White-cheeked Honeyeater is an absolute stonking crippler in Victoria, but Stu was not actually trying to string a rarity, he'd just got such a flood of new information swirling around his brain that sometimes it got jumbled up.

2005, Sean Dooley, The Big Twitch, Sydney: Allen and Unwin, page 67